Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a07b798af5ccdb2…

MALICIOUS

PDF

67.5 KB Created: 2020-10-15 12:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-20
MD5: 5223c957b27840f5d983abe8973f270d SHA-1: aaa7f1aa89966ac7203273dc8979a2a260034e5c SHA-256: 8a07b798af5ccdb22101e06200f09cd6e5f6e3f108a8f28b6dc902d619a0b0e2
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?keyword=comparison+exercises+advanced+pdf In PDF document text
    • https://site-1039873.mozfiles.com/files/1039873/69699423058.pdfIn PDF document text
    • https://site-1043279.mozfiles.com/files/1043279/mewiripinovujuno.pdfIn PDF document text
    • https://site-1038429.mozfiles.com/files/1038429/97378365125.pdfIn PDF document text
    • https://site-1044020.mozfiles.com/files/1044020/28844427845.pdfIn PDF document text
    • https://site-1038999.mozfiles.com/files/1038999/44217402766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f87ff523686e.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/3419276.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/6897437.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/mofep.pdfIn PDF document text
    • https://site-1041684.mozfiles.com/files/1041684/fakojujitekopafomo.pdfIn PDF document text
    • https://site-1036829.mozfiles.com/files/1036829/58837232796.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/2278/6975/files/blue_merle_sheltie_puppy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7154/1926/files/gajanurepovoveri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7090/5750/files/change_password_quickbooks_2014.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1613/4551/files/mogujip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8860/4061/files/12217717127.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6250/4855/files/44398073576.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 5300 bytes
SHA-256: cc5132531caf0a29e24cb41024d19ce508d9403c0414a57dd5a3f5f4d77b5401
font_01_sfnt_off0000c72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 10668 bytes
SHA-256: 1843f64fbef9e9f0a6e01bd6705802c5c27a0e8391ecda4ddb60940177d748f0
font_02_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 16140 bytes
SHA-256: 00468df452218f546d59995a7cf9b4297092e2fd476dbd2f6ce79846bd051107

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